Twin Falls County, ID Shrink-Swell Risk

What Twin Falls County, ID's soil means for a foundation

Low

USDA's SSURGO data puts Twin Falls County, ID's soil at "Low" shrink-swell potential, an area-weighted linear extensibility of 2.57% across 73.1% of the county's surveyed land. That's the easiest starting point on this site's scale - a standard foundation is the reasonable default here, though any one lot can still differ.

This is a county figure, not a lot figure

USDA's survey covers the whole of Twin Falls County, ID at once, not any single address. The real answer for one lot is still a site-specific geotechnical report, running about $1,000-$5,000 (typically near $2,700).

Report cost vs. repair cost

With Twin Falls County, ID rating "Low", a geotechnical report is still worthwhile before a build, just less urgent than in a high-risk county. A geotechnical report runs $1,000-$5,000, typically around $2,700. Foundation repair, if a specific lot turns out to differ from the county average, runs $5,000-$15,000.

How Twin Falls County, ID compares

Nationally, Twin Falls County, ID is the 1,494-most-constrained of 3,085 rated counties for shrink-swell soil. Within Idaho alone it ranks 13 of 44. The county spans 1,922 square miles, home to 96,509 people.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Willacy County, TX and Custer County, ID are worth a look for comparison.

How this reading is built, and its real limits · Moisture management: the cheap fix that works on any soil

More of Idaho

Every county in Idaho is on this site, including Valley County, ID and Caribou County, ID. The full underlying dataset is downloadable directly, one row per county.